Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebf436ba8caecf0…

MALICIOUS

PDF

125.6 KB Created: 2021-06-05 18:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 88d82a7d1cf19bd74232a0551939f1f6 SHA-1: ebe909fcf747d4a2f8bad2c28c51afb09ec808c7 SHA-256: 8ebf436ba8caecf09925facecb137c66b801b38906cc7b1c38c7ef66b2f01559
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/pbw?utm_term=how+do+you+fix+a+broken+tuba PDF link annotation
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/vilediwinefa-damojut-xuzerixonosawop-jifafu.pdfIn PDF document text
    • https://vozuviwugil.weebly.com/uploads/1/3/2/6/132681927/7716964.pdfIn PDF document text
    • https://boxomuti.weebly.com/uploads/1/3/4/0/134016719/zifenanobero-bogesuda-xuwef.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/rapirukizutav.pdfIn PDF document text
    • https://tedatigajixa.weebly.com/uploads/1/3/0/7/130739480/1640237.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tovovojufa.pbworks.com/w/file/fetch/144669279/95105879729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be122aa-961a-4d75-8677-b531450c9dbb/download_film_rudy_habibie_dan_ainun_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31514dd-033e-43dc-ad0b-639938737614/romeo_and_juliet_summary_sparknotes_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38000e24-1805-42bc-a142-75b8fc4a1460/27859654693.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144456174/how_to_rotate_a_figure_90_degrees_counter_clockwise.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144489087/48954224187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4454e4-a819-4333-942f-fceccb50de92/why_did_they_replace_jason_on_pretty_little_liars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd8ed61-7809-4f2e-9826-76c5968c7efb/midulodipexeb.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/64047167597.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/f/120477181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76511a0d-e3d2-4953-80de-77d0a8812e85/crack_for_office_2013_professional_plus_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445fa76f-86df-4653-9114-c725d10a85f8/ipad_mini_2_screen_replacement_lcd.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001af3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF3E 5116 bytes
SHA-256: a86410b56755be7a1be6d581c13b798802f29e74767d1274e684f5f7188a5c9c
font_01_sfnt_off0001c0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0D3 11980 bytes
SHA-256: fc01397d00945e2cc8b48a2b62b504ab55d0b5ff0ba493726eb5303520b999ff